Spain affected the course of events in the crucial second half of the 1930s by becoming the major political and military testing ground. Spain provided the invaluable military and political experience in such matters as a role of aviation and artillery in modern war (tanks hadn’t won their spurs yet), relationship between the front line and rear, etc. Not always that experience was apprehended, and partly it became outdated with the beginning of the Second World War and its blitzkriegs. Military experts of the USSR and France could make sure that a «war of motors» might be a positional war — as the First World War was. It led to tragic mistakes in 1940–1941.
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The beginning of the Civil War, distribution of arms among civilians in the Republic led to the beginning of not just a socio-political, but deep social revolution, qualitative changes in property relations and the political system. As a result of industrial collectivization (incautation, socialization) in Spain, first of all in Catalonia and Aragon, a new sector of economy appeared that qualitatively differed both from the capitalist ones, and from the state ones — first of all by the advanced system of industrial democracy, participation of a worker in taking industrial decisions. The negative attitude of the anarchist doctrine to the «democracy» as to the multi-party parliamentary system didn’t prevent anarcho-syndicalists from incorporating democracy in the sphere of production. Relying on the trade-union structures, the аnarcho-syndicalists and the left socialists made a practical step to divorce a producer from the means of production. But it was just a step.
The dictatorship of the manager was replaced by the power of the collective represented by its core group (first of all trade-union leaders from CNT structure) and almost religious influence of anarchist slogans, contradiction with which could be considered the counterrevolution. However, the influence of the ideology shared by the significant mass of workers played the role of mobilizing the masses including at the place of production. The anarcho-syndicalists and the left socialists managed to create a rather effective and democratic social system (to the extent possible in the conditions of Civil War) based on the industrial democracy. Despite the heavy economic situation caused by war and split of the country, the collectivized industry prevented a steep decline in production. Introduction of industrial democracy system drove the productive efficiency which after all might be possible at the Spanish enterprises of the day in conditions of war and partial economic blockade. A myth about «disorganization of production by anarcho-syndicalists» could be considered completely wrong. When the workers and engineers took possession of factories, they did their best. The production volumes required to meet war demands exceeded the pre-war performance. However, the model of self-government and industrial democracy to be coordinated by trade unions and semi-government public structures dissatisfied the representatives of other political forces. In 1937 it resulted in a considerable aggravation of political struggle in the republican camp. The struggle against the industrial democracy which took place during Negrin’s government (1937–1939) contributed to a decline in the economic growth rate in comparison to the Largo Caballero governance.